Speed-indicator.



A. .B. JOHNSON.

SPEED INDICATOR.

APPLICATION FILED AUG.18, 1909.

980,531. 1 Patented Jan. 3, 1911.

2 SHEETS-SHEET l.

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UNITED STATES PATENT OFFICE.

AUGUST 3. JOHNSON, OF RED WING, MINNESOTA.

SPEED-INDICATOR.

To all whom it may concern:

Be it known that 1, AUGUST B. J oHNsoN, a citizen of the United States,residing at Red l/Ving, in the county of Goodhue, State of Minnesota,have invented certain new and useful Improvements in Speed-Indicators;and I do hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same.

This invention relates to improvements in speed governors and hasparticular reference to the governors employed with traction engineswhich are used for operating harvesting machines.

The principal object of the invention is the provision of a means forregulating the centrifugal governors according to use to which theengine is to be put. That is to say that the governors may be adjustedto a position, when the engine is employed to transport the device fromplace to place, different to what would be necessary when the engine isemployed to operate a threshing machine.

Another object is the provision of an indicator which is adapted to showthe maximum speed the engine is to make when threshing and when drivingthe device from place to place. 7

With these and other objects in view as will more fully hereinafterappear, the resent invention consists in certain nove details ofconstruction and arrangement of parts, hereinafter fully described,illustrated in the accompanying drawings and more particularly pointedout in the appended claim; it being understood that various changes inthe form, proportion, size and minor details of the device may be madewithout departing from the spirit or sacri ficing any of the advantagesof the invention.

In the accompanying drawings forming part of the specifications :Figurel is a side elevation of the device. Fig. 2 is a plan view thereof. Fig. 3 is a front elevation of the device showing the adjusting shaft incross section. Fig. 4 is a longitudinal sectional view on the adjustingshaft.

Specification of Letters Patent.

Application filed August 18, 1909.

Patented Jan. 3, 1911. Serial No. 513,430.

Similar numerals of reference are employed to designate correspondingparts throughout.

As before stated, the device is intended primarily for use with thattype of traction engines used for driving threshing machines. The formof governor shown is of the centrifugal type and is adapted to operatethe cut-off valve by a downward pressure. The lower end of the bearingshaft of this governor enters a casing designated by the numeral 5, thesaid casing having a central bore extending for a portion of the lengthof the casing and terminating in a lateral extension, the whole forminga somewhat curved chamber in which is disposed a plu-' rality of balls6, which are of a size to nicely fit within the casing and bear one uponthe other. The lower end of the governor bearing shaft bears on theupper-most of these balls and it is evident by forcing the said ballsupwardly by 'a mechanism about to be described that the governor headwill be spaced from the valve stem so that the speed of the engine maybe considerably increased before the governor head bears on the valvestem to cut off the steam to the engine cylin der and conversely whenthe balls are lowered and the governor head brought nearer the valvestem the engine will make a less number of revolutions per minute beforethe valve operates to cut off the steam from the cylinder. Since thistype of governor forms no part of the present invention a furtherdescription of the same need not be given.

The lateral terminal of the bore of the casing 5 is screw threaded andreceives the threaded end of a regulatingshaft 7, the opposite or freeend of which is provided with a hand or turning wheel 8. Extendinglongitudinally of the shaft and spaced from the opposite sides thereofare a pair of rods 9 and 10. These members are secured at one end to theinner face of the hand wheel 8 and terminate at a point adjacent theopposite or threaded terminal of the shaft 7.

A sleeve is designated in general by the numeral 11. This member isconsiderably less in length than the length of the shaft 7 and on itsouter face is provided with a spiral 12, constituting a worm gear. The

sleeve 11 is provided with a central opening to loosely receive theshaft 7 and on either side of the said central opening is provided withopenings to receive the rods 9 and 10. I

With this construction it is obvious that the sleeve will rotate withthe shaft but is capable of longitudinal movement thereon. Surroundingthat portion of the shaft 7 between one end of the sleeve and hand wheel8 is a helical compression spring 13, the function of which is toyieldingly hold the sleeve toward the opposite end of the shaft. Withthe construction thus far described it is evident when necessary toraise the bear ing shaft of the governor that the same can be done byturning the shaft to the right, this will cause its threaded end toenter farther into the lateral extension of the bore and press on thelower-most ball, whereby the bearing shaft of the governor will rise. Itwill be observed that during the inward movement of the shaft the sleeve11 will be likewise rotated but owing to one of its ends bearing on theouter edge of the. lateral extension of the bore, it will, as the shaft7 moves inwardly remain stationary with respect to the longitudinalmovement of the shaft, whereby the spring 13 will be compressed.

It is evident when the operator adjusts the governor for the purposebefore described that a means should be provided to indicate the numberof revolutions the fly wheel of the engine will make at maximum speedafter the adjustment has been accomplished and in order to carry outthis construction. the following arrangement is employed :By referringnow to Fig. 2 it will be seen that projecting laterally from the boilerof the engine or suitably secured to any portion of the latter andextending in a horizontal plane and at right-angles to the governor is abracket designated in general by the numeral 14. This member is arrangedadjacent the casing 5 and below the shaft 7 and extends outwardly for asuitable distance and terminates ina movable arm 15. The arm 15 isadjustably secured to the free end of the bracket by means of a setscrew 16 and is arranged at right angles to the arm and parallel withthe boiler (not shown). The arm 15 is provided with a bearing sleeve 16extending in a horizontal plane and which receives a shaft 18. Thatterminal of the shaft extending in advance of the free end of the arm 15has journaled thereon an indicator disk 19. The opposite faces of thisdisk are perfectly flat and the front face is provided with suitableindicia indicating the number of'revolutions the engine is capable ofproducing after the governor has been adjusted to its several positionsas clearly shown in Fig. 3. An indicator hand 20 is held suspended overthat face of the indicator provided with the indicia. It is evident thatthis hand is stationary so that when the indicator disk is turned' themarkings under-lying the indicator hand will show the number ofrevolutions the engine is capable of making in its adjusted position.Extending laterally from the bracket arm 14L are a pair of supports 21and 22. These supports are parallel with the boiler and arm 15 andterminate in bearing sleeves 23 and 24:, which are disposed at rightangles to the supports and bearing sleeves l7. Journaled in the bearingsleeves 23 and 24 is a shaft 25, one terminal of which is provided witha worm, the teeth of which mesh with the worm gear 12 on the sleeve 11.The opposite end of the shaft 25 terminates at a point adjacent theindicator disk 19 and is provided with a friction pulley 27, which bearson the inner face of the indicator disk 19. It is obvious with thisconstruction when the shaft 7 is turned by means of the hand wheel toadjust the governor in the manner before described that the indicatordisk by virtue of its connection with the worm gear 11 will be likewiseturned. It is to be understood that the gearing between the worm gearand disk is so proportioned that a turn of the shaft 7 which would besuflicient to adjust the governor to permit the engine to make fiftymore revolutions per minute will advance the indicator disk so that thenumeral on the latter under-lying the indicating hand will indicate theamount of revolutions the engine is capable of making with the newadjustment.

This device will be found very advantageous by traction engine operatorssince it is well known that different speeds are required for thedifferent kinds of grain to be threshed. It can be further seen that thedevice is exceedingly simple in structure and comparatively inexpensiveto manufacture, embodying few parts and these so arranged that thedanger of derangement will be reduced to a minimum.

WVhat is claimed as new, is

The combination with a governor having a threaded opening in one side ofits shell, a series of governor valve stem regulating balls leading tosaid opening, and an extension forming a stop adjacent to said opening,of a shaft having one end threaded in said opening and bearing on saidballs, a hand wheel on the opposite end of said shaft for advancing andretracting the shaft whereby to move said balls, a plurality of fingerssecured to said hand wheel, a worm having orifices loosely receivingsaid shaft and fingers whereby the worm is mounted for combinedrevoluble and sliding movement on said shaft, a spring interposed be- Intestimony whereof, I affix my signatween said hand Wheel and Worm andholdture, in presence of two Witnesses. ing the Worm in abutting contactWith said stop, a bracket engageable with said gov- AUGUST JOHNSONernor, a dial on said bracket, and an opera- Witnesses: tive connectionbetween said Worm and said J. H. BOUSTEAD,

dial. JOHN F. MERRILL.

